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French Onion Chicken Orzo Casserole

French Onion Chicken Orzo Casserole combines caramelized onions with creamy orzo and shredded chicken.Mozzarella and Parmesan create a rich, cheesy sauce and golden topping.It’s baked until bubbly for a comforting family dinner.
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Prep Time 15 minutes
Course Main Course
Cuisine French-Inspired American

Ingredients
  

  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 2 large yellow onions thinly sliced
  • 1 teaspoon sugar
  • 1/2 teaspoon salt
  • 3 garlic cloves minced
  • 1 1/2 cups orzo pasta
  • 2 cups cooked shredded halal chicken
  • 1/2 teaspoon dried thyme
  • 1/4 teaspoon black pepper
  • 2 cups low-sodium chicken broth
  • 1 cup heavy cream or half-and-half
  • 1 1/2 cups shredded mozzarella cheese divided
  • 1/2 cup grated Parmesan cheese
  • 1/2 teaspoon balsamic glaze optional
  • Fresh thyme or parsley optional for garnish

Instructions
 

  • Caramelize the onions. Melt the butter with the olive oil in a large oven-safe skillet or Dutch oven over medium heat. Add the sliced onions, sugar, and salt.
  • Cook for 20–25 minutes, stirring occasionally, until the onions become soft and deeply golden. Lower the heat if they begin browning too quickly. Add the minced garlic during the final 1–2 minutes.
  • Toast the orzo. Stir the dry orzo into the caramelized onions and cook for about 2 minutes, stirring frequently.
  • Add the chicken and seasonings. Stir in the shredded chicken, dried thyme, black pepper, and optional balsamic glaze until evenly combined.
  • Add the liquids. Pour in the chicken broth and heavy cream. Stir well and bring everything to a gentle simmer.
  • Reduce the heat to low, cover, and cook for approximately 8–10 minutes, stirring occasionally so the orzo doesn't stick to the bottom. Cook until the pasta is nearly tender and the mixture is creamy.
  • Add the cheese. Stir 1 cup of mozzarella and all of the Parmesan into the French Onion Chicken Orzo Casserole until melted and creamy.
  • Bake. Preheat the oven to 375°F (190°C). Sprinkle the remaining 1/2 cup mozzarella evenly over the casserole.
  • Bake uncovered for 10–15 minutes, or until the sauce is bubbling and the cheese is melted and lightly golden.
  • Rest and serve. Let the casserole rest for 5–10 minutes before serving. Garnish with fresh thyme or parsley if desired.

Notes

This casserole is best served while warm and creamy. Pair it with a crisp green salad, roasted broccoli, green beans, or steamed vegetables to balance the richness.
Chicken thighs can replace chicken breast for an even richer flavor. Leftover home-cooked chicken is also an excellent choice.
The consistency will naturally thicken as the casserole rests because the orzo continues absorbing sauce. If you prefer particularly creamy orzo, keep a little warm chicken broth nearby and stir in a splash before serving.